CN215628395U

CN215628395U - Double-cylinder part inner surface chromium plating tool

Info

Publication number: CN215628395U
Application number: CN202122017915.1U
Authority: CN
Inventors: 陈雄刚; 周建宏; 朱柯松; 丁越; 杨菁柯; 邓靖仪
Original assignee: Baoji University of Arts and Sciences
Current assignee: Baoji University of Arts and Sciences
Priority date: 2021-08-25
Filing date: 2021-08-25
Publication date: 2022-01-25
Anticipated expiration: 2031-08-25

Abstract

The utility model discloses a double-barrel part inner surface chromium plating tool, and belongs to the technical field of metal material surface treatment. The upper cover plate is provided with 2 upper cover plate central holes, and a plurality of arc waist holes are concentrically arranged outside the upper cover plate central holes; 2 base plate through holes are formed in the metal base plate; one end of the auxiliary anode rod is connected with the bottom plug, and the other end of the auxiliary anode rod sequentially penetrates through the through hole of the base plate and the central hole of the upper cover plate to be connected with a hanging tool which is hung on the upper end surface of the upper cover plate; the bottom plug is provided with a plurality of bottom plug through holes; the outer diameter of the arc waist hole is smaller than the diameter of the inner hole of the double-cylinder part and smaller than the diameter of the through hole of the base plate; the upper cover plate and the bottom plug are made of non-conductive materials. The utility model has reasonable structural design, convenient assembly and disassembly and good fluidity of the plating solution, effectively improves the quality of the plating layer of the inner hole of the part, solves the problems of small size of the plating layer of the orifice and leakage protection of the upper end surface, and improves the production efficiency and the batch qualification rate.

Description

Double-cylinder part inner surface chromium plating tool

Technical Field

The utility model belongs to the technical field of metal material surface treatment, and relates to a double-cylinder part inner surface chromium plating tool.

Background

The hard chromium plating has the excellent characteristics of high hardness, wear resistance, corrosion resistance, good chemical stability, low friction coefficient and the like, and is widely used as a wear-resistant plating and a repair plating of machine parts, shock absorbers, rotating shafts and the like. For the chromium plating of parts with complex structures, the problems of low dispersion capability of plating solution, poor deep plating and uniform plating capability and the like are easy to occur.

The inner surface of a double-cylinder part is chrome-plated, the inner surface of the cylinder is required to be chrome-plated, and the upper end surface, the hole bottom and the screw hole part and the outer surface of the part are not chrome-plated (as shown in figure 1), but the following three problems exist in the actual production: firstly, the chamfer angle of the inner hole of the chromium plating near the upper end face is small, and if the aperture size of the protection tool exceeds the inner hole diameter of the part in the process of protecting the upper end face, the phenomenon that a thick chromium layer exists on the part of the upper end face is easily caused, and great difficulty is brought to the subsequent working procedures such as grinding and processing; if the size of the protection tool is smaller than the diameter of the inner hole, the insulating tool can generate a certain shielding effect, so that the phenomenon that the size of the plating layer of the inner hole orifice of the part is seriously smaller is easily caused; secondly, because the inner hole diameter of the double-cylinder part is relatively small, if the protection tool is unreasonably designed, the fluidity of the plating solution in the electroplating process is poor, the local solution temperature is easily too high, and Cr is easily generated³⁺The concentration is not uniform, thereby causing the phenomena of high roughness of the plating layer, chrome nodule and the like,even air pockets are generated at the bottom of the hole, so that the problems of no plating layer at the part of the inner hole or over-thin thickness and the like are caused; and thirdly, the total surface area of the double-barrel part to be plated is larger, the requirement on the thickness of the plating layer is thicker, the looseness of the tool is easily caused when the tool is hung under high current density and longer plating time, the electric corrosion phenomenon is caused, the longer time is consumed for assembling and disassembling the tool before and after plating each time, the period is long, the cost is high, higher hidden danger of plating layer quality exists, and the batch production is not facilitated.

Disclosure of Invention

In order to solve the problems, the utility model aims to provide a double-cylinder part inner surface chromium plating tool which is reasonable in structural design, convenient to install and disassemble and good in fluidity of plating solution, effectively improves the quality of a part inner hole plating layer, solves the problems of small hole plating layer size and upper end surface leakage protection, and improves the production efficiency and batch qualification rate.

The utility model is realized by the following technical scheme:

the utility model discloses a double-cylinder part inner surface chromium plating tool which comprises a hanging hanger, an upper cover plate, a metal base plate, an auxiliary anode rod and a bottom plug, wherein the hanging hanger is arranged on the upper cover plate;

the upper cover plate is provided with 2 upper cover plate central holes, and a plurality of arc waist holes are concentrically arranged outside the upper cover plate central holes; 2 base plate through holes are formed in the metal base plate; one end of the auxiliary anode rod is connected with the bottom plug, and the other end of the auxiliary anode rod sequentially penetrates through the through hole of the base plate and the central hole of the upper cover plate to be connected with a hanging tool which is hung on the upper end surface of the upper cover plate; the bottom plug is provided with a plurality of bottom plug through holes; the outer diameter of the arc waist hole is smaller than the diameter of the inner hole of the double-cylinder part and smaller than the diameter of the through hole of the base plate; the upper cover plate and the bottom plug are made of non-conductive materials;

when the tool is used, the upper cover plate, the metal base plate and the upper end faces of the double-cylinder parts are fixedly connected in sequence, the hanging lifting tool is connected with the anode bar of the chromium plating groove, and the bottom plug is arranged in the hole bottom screw hole of the double-cylinder parts.

Preferably, a hanger screw hole is formed in the lower end of the hanger, an annular groove is formed in the outer surface of the upper end of the hanger, the hanger screw hole is in threaded connection with one end of the auxiliary anode rod, and a lead is wound in the annular groove and connected with the anode rod of the chromium plating groove through the lead.

Further preferably, the outer surface of the hanger is a conical surface from top to bottom.

Preferably, the upper cover plate is provided with a plurality of upper cover plate connecting holes, the metal base plate is provided with a plurality of base plate connecting holes, and the cover plate connecting holes and the base plate connecting holes are in one-to-one correspondence with the connecting holes in the upper end face of the double-cylinder part respectively.

Preferably, 2 arc waist holes are symmetrically formed in the outer side of the center hole of the upper cover plate, and the arc length of each arc waist hole corresponds to the central angle of 140-160 degrees.

Preferably, the through hole of the base plate is a taper hole with the taper of 1-2 degrees, and the diameter of the small end of the through hole of the base plate is 93-97% of the diameter of the inner hole of the double-cylinder part.

Preferably, the centers of the center hole of the upper cover plate, the through hole of the base plate and the inner hole of the double-cylinder part are all located on the axis of the auxiliary anode rod.

Preferably, the diameter of the auxiliary anode rod is 93-97% of the diameter of the inner hole of the double-cylinder part.

Preferably, the bottom plug is provided with a bottom plug central screw hole, the bottom plug central screw hole is in threaded connection with one end of the auxiliary anode rod, and a plurality of bottom plug through holes are uniformly distributed in the circumferential direction of the bottom plug central screw hole.

Preferably, the hanging sling and the metal backing plate are made of stainless steel; the upper cover plate and the bottom plug are made of high molecular polymer materials; the auxiliary anode rod is made of lead-antimony alloy containing 6-8% of antimony.

Compared with the prior art, the utility model has the following beneficial technical effects:

the utility model discloses a double-cylinder part inner surface chromium plating tool, which fixes an auxiliary anode rod through a hanging hanger and a bottom plug at the upper end and the lower end, positions the anode rod through a cover plate, arranges an arc waist hole on the upper cover plate, arranges a bottom plug through hole on the bottom plug, effectively protects the upper end surface of a part and a non-plating part, avoids the phenomenon of non-uniform plating at the bottom part of the hole due to the shielding of the tool, increases the flowing exchange property of plating solution, and improves the heat dissipation property and Cr in a cylinder in the plating process³⁺Concentration, the quality of the inner surface coating is greatly improved. Upper cover plateAnd a metal base plate is arranged between the upper end face of the part and the upper end face of the part, and the outer diameter of the arc-shaped waist hole is smaller than the diameter of the inner hole of the double-cylinder part and smaller than the diameter of the through hole of the base plate, so that the chromium plating size at the hole opening of the part is effectively ensured. The upper cover plate and the bottom plug are made of non-conducting materials, so that anode abrasion and corrosion are effectively protected. The overall structure of frock is simple, and the installation is dismantled conveniently, can used repeatedly, and the operability is strong. After the tool is used, the groove loading amount can reach 5 pieces (the groove loading amount is 3 pieces before the tool is not used), the generation efficiency can be greatly improved, and the plating cost is saved.

Furthermore, the hanging sling has simple structure, and can fix the auxiliary anode bar and connect with the anode bar of the chromium plating bath.

Furthermore, the outer surface of the hanging hanger is a conical surface from top to bottom, so that the weight can be reduced.

Furthermore, the upper cover plate and the metal base plate are connected with the connecting holes in the upper end faces of the double-cylinder parts through the connecting holes, so that the connection is firm and reliable, and an additional fixing tool is not needed.

Further, 2 arc waist holes are symmetrically formed in the outer side of the center hole of the cover plate, the arc length of each arc waist hole corresponds to the central angle of 140-160 degrees, the numerical value is too small, the flow area of the plating solution is small, the flowability is poor, the numerical value is too large, and the strength of the cover plate cannot be guaranteed.

Furthermore, the through hole of the base plate is a taper hole with the taper of 1-2 degrees, and the diameter of the small end of the through hole of the base plate is 93% -97% of the diameter of the inner hole of the double-cylinder part, so that the hole opening size of the part can be ensured, a chromium layer can be prevented from being deposited on the end face of the part, and the plating precision is effectively improved.

Furthermore, the center hole of the upper cover plate, the through hole of the base plate and the centers of the inner holes of the double-cylinder parts are all positioned on the axis of the auxiliary anode rod, so that the uniformity of the plating layer at each position in the holes is ensured.

Furthermore, the central screw hole of the bottom plug is in threaded connection with one end of the auxiliary anode rod, so that the connection is simple and reliable, the installation and the disassembly are convenient, and meanwhile, a plurality of through holes of the bottom plug are uniformly distributed in the circumferential direction of the central screw hole of the bottom plug, so that the plating solution flows smoothly and uniformly.

Furthermore, the hanging hanger and the metal backing plate are made of stainless steel materials, do not react with plating solution while conducting electricity, and are corrosion-resistant and long in service life; the upper cover plate and the bottom plug are made of high molecular polymer materials, so that the strength is high, the processing is convenient, and the service life is long.

Drawings

FIG. 1 is a schematic cross-sectional view of a double-barrel part;

FIG. 2 is a schematic top view of a double-barrel part;

FIG. 3 is a schematic view of the overall structure of the present invention;

FIG. 4 is a schematic structural view of the upper cover plate;

FIG. 5 is a schematic structural view of a metal shim plate;

FIG. 6 is a schematic structural view of a bottom plug;

FIG. 7 is a schematic diagram of a construction of a loading spreader;

fig. 8 is a schematic structural view of the auxiliary anode rod.

In the figure, 1 is a hanging hanger, 1-1 is a hanger screw hole, 1-2 is an annular groove, 2 is a bolt, 3 is an upper cover plate, 3-1 is an upper cover plate center hole, 3-2 is an arc waist hole, 3-3 is an upper cover plate connecting hole, 4 is a metal backing plate, 4-1 is a backing plate through hole, 4-2 is a backing plate connecting hole, 5 is a nut, 6 is an auxiliary anode rod, 7 is a bottom plug, 7-1 is a bottom plug center screw hole, and 7-2 is a bottom plug through hole.

Detailed Description

The utility model is described in further detail below with reference to the following figures and examples:

referring to fig. 3, the tool for plating chromium on the inner surfaces of the double-cylinder parts comprises a hanging hanger 1, an upper cover plate 3, a metal base plate 4, an auxiliary anode rod 6 and a bottom plug 7.

The upper cover plate 3 is provided with 2 upper cover plate center holes 3-1, and a plurality of arc waist holes 3-2 are concentrically arranged outside the upper cover plate center holes 3-1; the metal backing plate 4 is provided with 2 backing plate through holes 4-1; one end of an auxiliary anode rod 6 is connected with a bottom plug 7, the other end of the auxiliary anode rod sequentially penetrates through a through hole 4-1 of a base plate and a central hole 3-1 of an upper cover plate to be connected with a hanging hanger 1, and the hanging hanger 1 is hung on the upper end surface of the upper cover plate 3; the bottom plug 7 is provided with a plurality of bottom plug through holes 7-2; the outer diameter of the arc-shaped waist hole is 3-2 smaller than the diameter of the inner hole of the double-cylinder part and 4-1 smaller than the diameter of the through hole of the base plate; the upper cover plate 3 and the bottom plug 7 are made of non-conductive materials; when the tool is used, the upper cover plate 3, the metal base plate 4 and the upper end faces of the double-cylinder parts are fixedly connected in sequence, the hanging lifting appliance 1 is connected with the anode bar of the chromium plating groove, and the bottom plug 7 is arranged in a hole bottom screw hole of the double-cylinder parts.

In a preferred embodiment of the present invention, as shown in fig. 8, the length of the main body of the auxiliary anode rod 6 is equal to the length of the inner hole of the double-cylinder part, and the two ends of the main body are respectively provided with a screw for screwing with the hanging tool 1 and the bottom plug 7.

Referring to fig. 7, in a preferred embodiment of the present invention, a hanger screw hole 1-1 is formed inside the lower end of a hanger 1, an annular groove 1-2 is formed on the outer surface of the upper end, the hanger screw hole 1-1 is screwed with one end of an auxiliary anode rod 6, and a lead is wound in the annular groove 1-2 and connected with an anode bar of a chrome plating groove through the lead. Preferably, the outer surface of the hanging sling 1 is a conical surface from top to bottom.

In a preferred embodiment of the utility model, a plurality of upper cover plate connecting holes 3-3 are formed in the upper cover plate 3, a plurality of pad plate connecting holes 4-2 are formed in the metal pad plate 4, and the cover plate connecting holes 3-3 and the pad plate connecting holes 4-2 are respectively in one-to-one correspondence with the connecting holes in the upper end surfaces of the double-cylinder parts.

Referring to fig. 4, in a preferred embodiment of the present invention, 2 arc-shaped waist holes 3-2 are symmetrically formed outside a center hole 3-1 of an upper cover plate, and an arc length of each arc-shaped waist hole 3-2 corresponds to a central angle of 140 to 160 °.

Referring to fig. 5, in a preferred embodiment of the present invention, the through hole 4-1 of the backing plate is a tapered hole with a taper of 1-2 °, and the diameter of the small end of the through hole 4-1 of the backing plate is 93% -97% of the diameter of the inner hole of the double-cylinder component.

In a preferred embodiment of the utility model, the centers of the center hole 3-1 of the upper cover plate, the through hole 4-1 of the backing plate and the inner hole of the double-cylinder part are all positioned on the axis of the auxiliary anode rod 6.

In a preferred embodiment of the utility model, the diameter of the auxiliary anode rod 6 is 93-97% of the diameter of the inner hole of the double-cylinder part.

Referring to fig. 6, in a preferred embodiment of the present invention, a bottom plug central screw hole 7-1 is formed in the bottom plug 7, the bottom plug central screw hole 7-1 is screwed with one end of the auxiliary anode rod 6, and a plurality of bottom plug through holes 7-2 are uniformly distributed in the circumferential direction of the bottom plug central screw hole 7-1.

In a preferred embodiment of the utility model, the hanging sling 1 and the metal backing plate 4 are made of stainless steel; the upper cover plate 3 and the bottom plug 7 are made of high molecular polymer materials; the auxiliary anode rod 6 is made of lead-antimony alloy rod containing 6-8% of antimony.

The structure and the working method of the double-cylinder part inner surface chromium plating tool of the utility model are further explained by a specific embodiment as follows:

as shown in figures 1 and 2, the part is a common double-barrel part, the size of an inner hole of the part is phi 35.05, the depth of the hole is 240mm, the thickness of chromium plating is required to be 250 mu m, the upper end face, the threaded part of the hole bottom and the outer surface of the part are not subjected to chromium plating treatment, and the chamfer of an orifice of the inner hole close to the upper end face is smaller and is R0.5.

The bottom plug 7, the upper cover plate 3, the metal base plate 4 and the end faces of the double-cylinder parts are fixed through bolts 2 and nuts 5, and the auxiliary anode rod 6 is fixed through the hanging tool 1 and the bottom plug 7 through threads; the upper cover plate 3 and the bottom plug 7 are made of polytetrafluoroethylene materials, the metal base plate 4 and the hanging hanger 1 are made of stainless steel, wherein an inner hole of the metal base plate 4 is a conical surface with the taper of 1-2 degrees, and the diameter of the inner cone is 2mm larger than that of an inner hole of a double-cylinder part; the auxiliary anode rod 6 is made of lead-antimony alloy rod containing 6-8% of antimony.

This frock is when using:

1) fixing a metal backing plate 4 and an upper cover plate 3 on the upper end surface of a double-cylinder part sequentially through four phi 6 bolts 2 and nuts 5, placing the metal backing plate 4 (with the thickness of 8mm) on the upper end surface of the part at first when in specific use, and checking that the circle phi 37.05 of an inner taper hole of the metal backing plate 4 is coaxial with the inner hole phi 35.05 of the double-cylinder part; then the upper cover plate 3 is placed on the metal backing plate 4 and is fixedly fixed with the nut 5 through the bolt 2, wherein the diameter (phi 34) of the arc-shaped waist hole 3-2 is slightly smaller than the diameter (phi 37.05) of the backing plate through hole 4-1, so that the fluidity of the plating solution is ensured as much as possible;

2) the auxiliary anode rods 6 are respectively inserted into the central holes 3-1 of the upper cover plate, the diameter (phi 14.5) of the central holes 3-1 of the upper cover plate is slightly larger than the diameter of the auxiliary anode rods 6 (phi 14), and the auxiliary anode rods 6 cannot deviate in the electroplating process; then connecting and fixing the bottom plug 7 with the M14 internal thread hole with the auxiliary anode bar 6;

3) connecting the hanging sling 1 with the upper end thread part of the auxiliary anode rod 6, and ensuring that the small end surface of the hanging sling 1 is attached to the upper surface of the upper cover plate 3;

4) copper wires are wound on the part of the annular groove 1-2 of the hanging hanger 1 and connected with the anode bar of the chromium plating groove, double cylinder parts are hung and connected with the anode bar of the chromium plating groove, and chromium electroplating operation is carried out after the hanging is fixed.

It should be noted that the above description is only one embodiment of the present invention, and all equivalent changes of the system described in the present invention are included in the protection scope of the present invention. Persons skilled in the art to which this invention pertains may substitute similar alternatives for the specific embodiments described, all without departing from the scope of the utility model as defined by the claims.

Claims

1. A double-cylinder part inner surface chromium plating tool is characterized by comprising a hanging hanger (1), an upper cover plate (3), a metal base plate (4), an auxiliary anode rod (6) and a bottom plug (7);

2 upper cover plate center holes (3-1) are formed in the upper cover plate (3), and a plurality of arc-shaped waist holes (3-2) are concentrically arranged on the outer side of the upper cover plate center hole (3-1); 2 backing plate through holes (4-1) are formed in the metal backing plate (4); one end of the auxiliary anode rod (6) is connected with the bottom plug (7), the other end of the auxiliary anode rod sequentially penetrates through the through hole (4-1) of the base plate and the central hole (3-1) of the upper cover plate to be connected with the hanging hanger (1), and the hanging hanger (1) is hung and hung on the upper end face of the upper cover plate (3); a plurality of bottom plug through holes (7-2) are arranged on the bottom plug (7); the outer diameter of the arc waist hole (3-2) is smaller than the diameter of the inner hole of the double-cylinder part and smaller than the diameter of the through hole (4-1) of the base plate; the upper cover plate (3) and the bottom plug (7) are made of non-conductive materials;

when the tool is used, the upper cover plate (3), the metal base plate (4) and the upper end faces of the double-cylinder parts are fixedly connected in sequence, the hanging lifting appliance (1) is connected with the anode bar of the chromium plating groove, and the bottom plug (7) is arranged in a hole bottom screw hole of the double-cylinder parts.

2. The tool for plating chromium on the inner surfaces of the double-cylinder parts according to claim 1, wherein a hanger screw hole (1-1) is formed in the lower end of the hanger (1), an annular groove (1-2) is formed in the outer surface of the upper end of the hanger, the hanger screw hole (1-1) is in threaded connection with one end of the auxiliary anode rod (6), and a lead is wound in the annular groove (1-2) and is connected with the anode rod of the chromium plating groove through the lead.

3. The tool for plating chromium on the inner surfaces of double-cylinder parts according to claim 2, wherein the outer surface of the hanging hanger (1) is a conical surface from top to bottom.

4. The tool for plating chromium on the inner surfaces of the double-barrel parts according to claim 1, wherein a plurality of upper cover plate connecting holes (3-3) are formed in the upper cover plate (3), a plurality of base plate connecting holes (4-2) are formed in the metal base plate (4), and the cover plate connecting holes (3-3) and the base plate connecting holes (4-2) are respectively in one-to-one correspondence with the connecting holes in the upper end surfaces of the double-barrel parts.

5. The double-barrel part inner surface chromium plating tool according to claim 1, wherein 2 arc-shaped waist holes (3-2) are symmetrically formed in the outer side of the upper cover plate central hole (3-1), and the arc length of each arc-shaped waist hole (3-2) corresponds to a central angle of 140-160 degrees.

6. The tool for plating chromium on the inner surfaces of the double-barrel parts according to claim 1, wherein the through hole (4-1) of the base plate is a taper hole with a taper of 1-2 degrees, and the diameter of the small end of the through hole (4-1) of the base plate is 93-97% of the diameter of the inner hole of the double-barrel part.

7. The tool for plating chromium on the inner surfaces of the double barrel parts according to claim 1, wherein the centers of the center hole (3-1) of the upper cover plate, the through hole (4-1) of the base plate and the inner holes of the double barrel parts are all located on the axis of the auxiliary anode rod (6).

8. The tool for plating chromium on the inner surfaces of the double-cylinder parts according to claim 1, wherein the diameter of the auxiliary anode rod (6) is 93-97% of the diameter of the inner hole of the double-cylinder parts.

9. The tool for plating chromium on the inner surfaces of double barrel parts according to claim 1, wherein a bottom plug central screw hole (7-1) is formed in the bottom plug (7), the bottom plug central screw hole (7-1) is in threaded connection with one end of the auxiliary anode rod (6), and a plurality of bottom plug through holes (7-2) are uniformly distributed in the circumferential direction of the bottom plug central screw hole (7-1).

10. The tool for plating chromium on the inner surfaces of the double-cylinder parts according to claim 1, wherein the hanging hanger (1) and the metal backing plate (4) are made of stainless steel; the upper cover plate (3) and the bottom plug (7) are made of high molecular polymer materials; the auxiliary anode bar (6) is made of lead-antimony alloy containing 6-8% of antimony.